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Connect a tone generator and use a probe to work out which cable that is. Either disconnect the AP and plug the generator into that cable for a while or identify both of the others. Be careful with PoE and cheap tone generators as they can destroy each other.
Something like https://www.amazon.co.uk/ELEGIANT-Tracker-Detector-Multifunction-Ethernet/dp/B01HJQ4JA4/ (I haven't used that one)
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jellybaby
Nef
@aggi
I have a bundle of three network cables. One is in use for an access point which uses power over ethernet (24V), the other two are unused. I want to cut into one of the unused ones so I can add a connection there.
Is there a non-destructive way to detect which is the live cable?